Full Idea
Whether a man is speaking of behaviour as rude or not rude, he must use the same criteria as anyone else. ...We have here an example of a non-evaluative premise from which an evaluative conclusion can be deduced.
Gist of Idea
Whether someone is rude is judged by agreed criteria, so the facts dictate the value
Source
Philippa Foot (Moral Arguments [1958], p.104)
Book Reference
Foot,Philippa: 'Virtues and Vices' [Blackwell 1981], p.104
A Reaction
We would now call 'rude' a 'thick' ethical concept (where 'good' is 'thin'). Her powerful point is, I take it, that evidence is always relevant to judgements of thick concepts, so there is no fact-value gap. 'Rude' has criteria, but 'good' may not.
Related Idea
Idea 22376 Facts and values are connected if we cannot choose what counts as evidence of rightness [Foot]